Optimization of a robust collaborative-relay beamforming design for simultaneous wireless information and power transfer  

作　　者：Lu-lu ZHAO Xing-long JIANG Li-min LI Guo-qiang ZENG Hui-jie LIU 

机构地区：[1]Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [2]Shanghai Engineering Center for Microsatellites,Shanghai 201210,China [3]College of Mathematics,Physics and Electronic Information Engineering,Wenzhou University,Wenzhou 325035,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2018年第11期1432-1443,共12页信息与电子工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61601295);the Zhejiang Provincial Natural Science Foundation of China(No.LY18F030015)

摘　　要：We investigate a collaborative-relay beamforming design for simultaneous wireless information and power transfer. A non-robust beamforming design that assumes availability of perfect channel state information(CSI) in the relay nodes is addressed. In practical scenarios, CSI errors are usually inevitable; therefore, a robust collaborativerelay beamforming design is proposed. By applying the bisection method and the semidefinite relaxation(SDR)technique, the non-convex optimization problems of both non-robust and robust beamforming designs can be solved.Moreover, the solution returned by the SDR technique may not always be rank-one; thus, an iterative sub-gradient method is presented to acquire the rank-one solution. Simulation results show that under an imperfect CSI case, the proposed robust beamforming design can obtain a better performance than the non-robust one.We investigate a collaborative-relay beamforming design for simultaneous wireless information and power transfer. A non-robust beamforming design that assumes availability of perfect channel state information(CSI) in the relay nodes is addressed. In practical scenarios, CSI errors are usually inevitable; therefore, a robust collaborativerelay beamforming design is proposed. By applying the bisection method and the semidefinite relaxation(SDR)technique, the non-convex optimization problems of both non-robust and robust beamforming designs can be solved.Moreover, the solution returned by the SDR technique may not always be rank-one; thus, an iterative sub-gradient method is presented to acquire the rank-one solution. Simulation results show that under an imperfect CSI case, the proposed robust beamforming design can obtain a better performance than the non-robust one.

关 键 词：SIMULTANEOUS WIRELESS INFORMATION and power transfer Channel state INFORMATION ROBUST BEAMFORMING SEMIDEFINITE relaxation Iterative sub-gradient 

分 类 号：TN92[电子电信—通信与信息系统]